Maleic anhydride grafted LLDPE having high melt index

Abstract

Disclosed is a linear low-density polyethylene grafted with maleic anhydride (MAH-g-LLDPE). The MAH-g-LLDPE has a unique combination of properties including a low density and a high melt index.

We claim: 
     
       1. A carpet backing comprising a linear low-density polyethylene grafted with maleic anhydride (MAH-g-LLDPE),
 wherein the MAH-g-LLDPE has a melt index (MI) of 250 to 800 g/10 minutes and a maleic anhydride content of 0.5 to 1.5 weight percent, based on the total weight of the MAH-g-LLDPE, 
 wherein the MI is measured in accordance with ASTM D1238, Condition 190/2.16, and 
 wherein the MAH-g-LLDPE is prepared in the absence of an added free radical initiator. 
 
     
     
       2. The carpet backing according to  claim 1 , wherein the LLDPE of the MAH-g-LLDPE has a density of 0.890 to 0.930 g/cm 3  before grafting. 
     
     
       3. The carpet backing according to  claim 1 , wherein the LLDPE of the MAH-g-LLDPE has a density of 0.900 to 0.925 g/cm 3  before grafting. 
     
     
       4. The carpet backing according to  claim 1 , wherein the LLDPE of the MAH-g-LLDPE is a copolymer of ethylene and 1-butene, 1-hexene, 1-octene, or mixtures thereof. 
     
     
       5. The carpet backing according to  claim 1 , wherein the LLDPE of the MAH-g-LLDPE has an MI of 0.5 to 10 g/10 minutes before grafting. 
     
     
       6. The carpet backing according to  claim 1 , wherein the MAH-g-LLDPE has an MI of 300 to 800 g/10 minutes. 
     
     
       7. A mixture of polymers, the mixture comprising a compatibilizer,
 wherein the compatibilizer comprises a linear low-density polyethylene (LLDPE) grafted with maleic anhydride (MAH-g-LLDPE), 
 wherein the MAH-g-LLDPE has a melt index (MI) of 250 to 800 g/10 minutes and a maleic anhydride content of 0.5 to 1.5 weight percent, based on the total weight of the MAH-g-LLDPE, 
 wherein the MI is measured in accordance with ASTM D1238, Condition 190/2.16, and 
 wherein the MAH-g-LLDPE is prepared in the absence of an added free radical initiator. 
 
     
     
       8. The mixture according to  claim 7 , which further comprises one or more polyolefins, ethylene copolymers, polyamides, polyesters, natural or synthetic rubbers, polyvinyl acetate or vinyl acetate-unsaturated carboxylic acid or ester copolymers, or polyurethanes. 
     
     
       9. The mixture according to  claim 7 , which further comprises one or more polyethylenes. 
     
     
       10. The mixture according to  claim 7 , which further comprises a propylene polymer or copolymer. 
     
     
       11. The mixture according to  claim 7 , which further comprises a wax. 
     
     
       12. The mixture according to  claim 7 , which further comprises a filler. 
     
     
       13. The mixture according to  claim 7 , wherein the LLDPE of the MAH-g-LLDPE has a density of 0.890 to 0.930 g/cm 3  before grafting. 
     
     
       14. The mixture according to  claim 7 , wherein the LLDPE of the MAH-g-LLDPE has a density of 0.900 to 0.925 g/cm 3  before grafting. 
     
     
       15. The mixture according to  claim 7 , wherein the MAH-g-LLDPE has an MI of 300 to 800 g/10 minutes. 
     
     
       16. A coating composition comprising:
 (a) a linear low-density polyethylene grafted with maleic anhydride (MAH-g-LLDPE); and 
 (b) a dispersant, 
 wherein the MAH-g-LLDPE has a melt index (MI) of 250 to 800 g/10 minutes and a maleic anhydride content of 0.5 to 1.5 weight percent, based on the total weight of the MAH-g-LLDPE, 
 wherein the MI is measured in accordance with ASTM D1238, Condition 190/2.16, 
 wherein the MAH-g-LLDPE is prepared in the absence of an added free radical initiator. 
 
     
     
       17. The coating composition according to  claim 16 , which further comprises a pigment. 
     
     
       18. The coating composition according to  claim 16 , which further comprises a dye. 
     
     
       19. The coating composition according to  claim 16 , wherein the LLDPE of the MAH-g-LLDPE has a density of 0.890 to 0.930 g/cm 3  before grafting.